Hi Werner,
Please add code to the meson and cmake build files that checks whether the Qt version you need is installed. If not, make them exit with an error. After you are done you can revert the work-around for older Qt5 versions :-)
OK, I've push the reverted version with check conditions in CMake and Meson scripts to the `gsoc-2022-chariri-3` branch (open a new branch in case you want to still use Qt 5.12 to checkout my progress). Let me know if the old `gsoc-2022-chariri-2` (containing the 5.12 workaround) is no longer needed.
Cheers, CharlieJiang
